问题:使用beautifulsoup提取属性值

我试图在网页上的特定“输入”标签中提取单个“值”属性的内容。我使用以下代码:

import urllib
f = urllib.urlopen("http://58.68.130.147")
s = f.read()
f.close()

from BeautifulSoup import BeautifulStoneSoup
soup = BeautifulStoneSoup(s)

inputTag = soup.findAll(attrs={"name" : "stainfo"})

output = inputTag['value']

print str(output)

我收到TypeError:列表索引必须是整数,而不是str

即使从Beautifulsoup文档中我了解到字符串在这里也不应该成为问题…但是我没有专家,我可能会误解了。

任何建议,不胜感激!提前致谢。

I am trying to extract the content of a single “value” attribute in a specific “input” tag on a webpage. I use the following code:

import urllib
f = urllib.urlopen("http://58.68.130.147")
s = f.read()
f.close()

from BeautifulSoup import BeautifulStoneSoup
soup = BeautifulStoneSoup(s)

inputTag = soup.findAll(attrs={"name" : "stainfo"})

output = inputTag['value']

print str(output)

I get a TypeError: list indices must be integers, not str

even though from the Beautifulsoup documentation i understand that strings should not be a problem here… but i a no specialist and i may have misunderstood.

Any suggestion is greatly appreciated! Thanks in advance.


回答 0

.find_all() 返回所有找到的元素的列表,因此:

input_tag = soup.find_all(attrs={"name" : "stainfo"})

input_tag是一个列表(可能仅包含一个元素)。根据您的确切要求,您应该执行以下任一操作:

 output = input_tag[0]['value']

或使用.find()仅返回一个(第一个)找到的元素的方法:

 input_tag = soup.find(attrs={"name": "stainfo"})
 output = input_tag['value']

.find_all() returns list of all found elements, so:

input_tag = soup.find_all(attrs={"name" : "stainfo"})

input_tag is a list (probably containing only one element). Depending on what you want exactly you either should do:

output = input_tag[0]['value']

or use .find() method which returns only one (first) found element:

input_tag = soup.find(attrs={"name": "stainfo"})
output = input_tag['value']

回答 1

在中Python 3.x,只需get(attr_name)在您使用的标签对象上使用find_all

xmlData = None

with open('conf//test1.xml', 'r') as xmlFile:
    xmlData = xmlFile.read()

xmlDecoded = xmlData

xmlSoup = BeautifulSoup(xmlData, 'html.parser')

repElemList = xmlSoup.find_all('repeatingelement')

for repElem in repElemList:
    print("Processing repElem...")
    repElemID = repElem.get('id')
    repElemName = repElem.get('name')

    print("Attribute id = %s" % repElemID)
    print("Attribute name = %s" % repElemName)

针对如下的XML文件conf//test1.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
    <singleElement>
        <subElementX>XYZ</subElementX>
    </singleElement>
    <repeatingElement id="11" name="Joe"/>
    <repeatingElement id="12" name="Mary"/>
</root>

印刷品:

Processing repElem...
Attribute id = 11
Attribute name = Joe
Processing repElem...
Attribute id = 12
Attribute name = Mary

In Python 3.x, simply use get(attr_name) on your tag object that you get using find_all:

xmlData = None

with open('conf//test1.xml', 'r') as xmlFile:
    xmlData = xmlFile.read()

xmlDecoded = xmlData

xmlSoup = BeautifulSoup(xmlData, 'html.parser')

repElemList = xmlSoup.find_all('repeatingelement')

for repElem in repElemList:
    print("Processing repElem...")
    repElemID = repElem.get('id')
    repElemName = repElem.get('name')

    print("Attribute id = %s" % repElemID)
    print("Attribute name = %s" % repElemName)

against XML file conf//test1.xml that looks like:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
    <singleElement>
        <subElementX>XYZ</subElementX>
    </singleElement>
    <repeatingElement id="11" name="Joe"/>
    <repeatingElement id="12" name="Mary"/>
</root>

prints:

Processing repElem...
Attribute id = 11
Attribute name = Joe
Processing repElem...
Attribute id = 12
Attribute name = Mary

回答 2

如果要从上面的源中检索属性的多个值,可以使用findAll和列表推导来获取所需的一切:

import urllib
f = urllib.urlopen("http://58.68.130.147")
s = f.read()
f.close()

from BeautifulSoup import BeautifulStoneSoup
soup = BeautifulStoneSoup(s)

inputTags = soup.findAll(attrs={"name" : "stainfo"})
### You may be able to do findAll("input", attrs={"name" : "stainfo"})

output = [x["stainfo"] for x in inputTags]

print output
### This will print a list of the values.

If you want to retrieve multiple values of attributes from the source above, you can use findAll and a list comprehension to get everything you need:

import urllib
f = urllib.urlopen("http://58.68.130.147")
s = f.read()
f.close()

from BeautifulSoup import BeautifulStoneSoup
soup = BeautifulStoneSoup(s)

inputTags = soup.findAll(attrs={"name" : "stainfo"})
### You may be able to do findAll("input", attrs={"name" : "stainfo"})

output = [x["stainfo"] for x in inputTags]

print output
### This will print a list of the values.

回答 3

我实际上建议您使用一种节省时间的方法,假设您知道哪种标签具有这些属性。

假设标签xyz的attritube名为“ staininfo”。

full_tag = soup.findAll("xyz")

而且我不希望您知道full_tag是一个列表

for each_tag in full_tag:
    staininfo_attrb_value = each_tag["staininfo"]
    print staininfo_attrb_value

因此,您可以获得所有标签xyz的staininfo的所有attrb值

I would actually suggest you a time saving way to go with this assuming that you know what kind of tags have those attributes.

suppose say a tag xyz has that attritube named “staininfo”..

full_tag = soup.findAll("xyz")

And i wan’t you to understand that full_tag is a list

for each_tag in full_tag:
    staininfo_attrb_value = each_tag["staininfo"]
    print staininfo_attrb_value

Thus you can get all the attrb values of staininfo for all the tags xyz


回答 4

您也可以使用:

import requests
from bs4 import BeautifulSoup
import csv

url = "http://58.68.130.147/"
r = requests.get(url)
data = r.text

soup = BeautifulSoup(data, "html.parser")
get_details = soup.find_all("input", attrs={"name":"stainfo"})

for val in get_details:
    get_val = val["value"]
    print(get_val)

you can also use this :

import requests
from bs4 import BeautifulSoup
import csv

url = "http://58.68.130.147/"
r = requests.get(url)
data = r.text

soup = BeautifulSoup(data, "html.parser")
get_details = soup.find_all("input", attrs={"name":"stainfo"})

for val in get_details:
    get_val = val["value"]
    print(get_val)

回答 5

我在Beautifulsoup 4.8.1中使用它来获取某些元素的所有类属性的值:

from bs4 import BeautifulSoup

html = "<td class='val1'/><td col='1'/><td class='val2' />"

bsoup = BeautifulSoup(html, 'html.parser')

for td in bsoup.find_all('td'):
    if td.has_attr('class'):
        print(td['class'][0])

重要的是要注意,即使属性只有一个值,属性键也会检索列表。

I am using this with Beautifulsoup 4.8.1 to get the value of all class attributes of certain elements:

from bs4 import BeautifulSoup

html = "<td class='val1'/><td col='1'/><td class='val2' />"

bsoup = BeautifulSoup(html, 'html.parser')

for td in bsoup.find_all('td'):
    if td.has_attr('class'):
        print(td['class'][0])

Its important to note that the attribute key retrieves a list even when the attribute has only a single value.


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